<!--
 * @Author zhaoyuemi
 * @Date 2021/5/24
 * @LastEditTime 2021/5/24
 * @LastEditors 86157
 * @Description ProductParam 产品参数组件
 * @FilePath
 * @ router
 * @version 1.0
-->

<template>
    <div class="nav-bar" :class="{'is_fixed':isFixed}">
        <div class="container">
            <div class="pro-title">
                {{title}}
            </div>
            <div class="pro-param">
                <a href="javascript:;">概述</a><span>|</span>
                <a href="javascript:;">参数</a><span>|</span>
                <a href="javascript:;">用户评价</a>
                <slot name="buy"></slot>
            </div>
        </div>
    </div>
</template>
<script>
    export default{
        name:'nav-bar',
        props:{
            title:String
        },
        data(){
            return{
                isFixed:false,  //是否固定
            }
        },
        methods:{
            initHeight(){
                let scrolltop = document.documentElement.scrollTop || window.pageYOffset || document.body.scrollTop
                this.isFixed = scrolltop > 152? true:false;
            }
        },
        mounted() {
            window.addEventListener('scroll',this.initHeight);
        },
        destroyed() {
            window.removeEventListener('scroll',this.initHeight,false);

        }
    }
</script>
<style lang="scss">
    @import './../assets/scss/config.scss';
    @import './../assets/scss/mixin.scss';
    .nav-bar{
        height:70px;
        line-height:70px;
        border-top:1px solid $colorH;
        background-color:$colorG;
        z-index:10;
        &.is_fixed{
            position:fixed;
            top:0;
            width:100%;
            box-shadow: 0 5px 5px $colorE;
        }
        .container{
            @include flex();
            .pro-title{
                font-size:$fontH;
                color:$colorB;
                font-weight:bold;
            }
            .pro-param{
                font-size:$fontJ;
                span{
                    margin:0 10px;
                }
                a{
                    color:$colorC;
                }
            }
        }
    }
</style>